code: def testJaxRoundTrip(self, shape, dtype, gpu):
      if xb.using_pjrt_c_api():
          self.skipTest(
              "DLPack support is incomplete in the PJRT C API"
          )  # TODO(skyewm)
      rng = jtu.rand_default(self.rng())
      np = rng(shape, dtype)
      if gpu and jtu.test_device_matches(["cpu"]):
          raise unittest.SkipTest("Skipping GPU test case on CPU")
      device = jax.devices("gpu" if gpu else "cpu")[0]
      x = jax.device_put(np, device)
      dlpack = jax.dlpack.to_dlpack(x)
      y = jax.dlpack.from_dlpack(dlpack)
      self.assertEqual(y.devices(), {device})
      self.assertAllClose(np.astype(x.dtype), y)
  
      self.assertRaisesRegex(
          RuntimeError,
          "DLPack tensor may be consumed at most once",
          lambda: jax.dlpack.from_dlpack(dlpack),
      )
  
imports: import unittest
  from absl.testing import absltest
  import jax
  import jax.dlpack
  import jax.numpy
  from jax._src import config
  from jax._src import test_util
  from jax._src import xla_bridge
  from jax._src.lib import xla_extension_version
  import numpy
label_desc: Use image node_id 2 for calling the DLPackTest obj's underlying member method code with example usage: obj.testJaxRoundTrip(shape, dtype, gpu) without return types